i use stanadyne ulsd fuel treatment additive in every tank for the lubricity values that the new diesel doesnt have. and i use seam foam every 5,000 miles. one can in the fuel filter housing and one in the tank. noticed better fuel mileage right away.

I have been running a quart of ATF in every other tank Done it for years and I have not had a problem on any my diesels regardless of Brand. But its really all up to you and what makes you feel good I guess.

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